LEARNit Dictionary
nonchalance
noun
/ˈnɒnʃələns/
UK
/ˌnɑːnʃəˈlɑːns/
US
1
a calm and relaxed way of behaving; behaviour that gives the impression you are not feeling worried
خونسردی, بیخیالی, عدم نگرانی
synonym
casualness(2)